Hello. Apologies for the confusion. My server side call looks like this 

https://adb-xxxxx.7.azuredatabricks.net/api/2.0/genie/spaces/01f06xxxxxxxxxx6001/conversations/01f0x...

The one in my original post is a proxy API call from the front end. This was working till yesterday afternoon and started throwing ERROR 500 after no response for a long time